method and device for numerically controlled, stempellosen and at least two-stage forming of sheet metal parts

摘要

PROBLEM TO BE SOLVED: To provide a method and an apparatus, by which method and apparatus, three-dimensional products, such as a trial product for press forming in mass production, can be precisely and quickly formed without any restrictions for a forming shape by preventing the wrinkles of a body, the reduction of a sheet thickness, etc.;SOLUTION: The method for forming a shape comprises the steps of: carrying out a drawing process by pushing a punch having the forming shape to a required height from the direction of a sheet thickness in the state that the edge portion of a blank material is gripped; and then carrying out a shape forming process by means of the punch and a tool from the opposite side of the sheet thickness in the state that the punch has been pushed-in and the flow of the material is locked by increasing a wrinkle suppressing force; and after that, carrying out a drawing process by reducing the wrinkle suppressing force and by lifting the punch to a required height again; and then carrying out a shape forming process by means of the tool in the state that the flow of the material is locked by increasing the wrinkle suppressing force. The above steps are repeated once or more.;COPYRIGHT: (C)2007,JPO&INPIT